For the past few months i have been getting what feels like pins and needles in my lower back and upper thighs.  It usually happens when i stand up from a sitting position.  Sometimes it gets so bad that i feel like I'm going to fall and i have to stop walking and stand still till it goes away.  I gave birth to my daughter almost a year and a half ago and i'm wondering if maybe this "tingle" feeling is related to the epidural? I feel like it is getting worse, and I'm worried.